Island



J. A. DECUIR.

STEREOSCOPIC CAMERA.

APPLICATION men um: 13. 1916.

2 SHEETS-SHEET 1.

Patented Oct. 28, 1919.

WITNESSES INVENTOR 4 TTORNEYS J. A. DECUIR.

STEREOSCOPIC CAMERA.

APPLICATION FILED Juana. 191s.

Patented Oct. 28, 1919.

2 SHEETSSHEET 2 WITNESSES A TTORNEYS JOSEPH A. DECUIB, 0F PROVIDENCE, RHODE ISL-ARI).

STEREOSCOPIC omens.

Specification of Letters Patent.

Patented Oct. 28, 1919.

Application filed June 13, 1916. Serial No, 103,468.

To all whom it may concern:

Be it known that I, JOSEPH A. DEcUIn, a citizen of the United States, and a resident of Providence, in the county of Providence and State of Rhode Island. have invented a certain new and useful Improvement in Stereoscopic Cameras, of which the followin is a specification.

fifyinvention relates to improvements in stereoscopic cameras, and it consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide a camera by means of which a stereoscopic image may be projected on the film or ground glass, each image has the appearance of 'solid1ty as if viewed through a stereoscope.

A further object of my invention is to provide a device of the type described havmg simple means for accomplishing the above named object.

My invention is illustrated in the accom-- panying application, in which:

Figure 1 is a front view of the lens tube;

Fig. 2 is a rear view of the front lens plate or carrier;

Fig. 3 is a. front view of the intermediate lens plate or carrier;

Fig. 4 is a front view of the rear plate or carrier;

Fig. 5 is a of F1g. 1;

Fig. '6 is a section along the line 66 section along the line 5-5 of F1g. 1;

Fig. 7 is a detail view of aportion of the device, and 7 Fig. 8 is a diagrammatic view showing the path of the rays stereoscopic. image. 7

In carrying out my invention, I make use of a camera or suitable casing 1 having a lens tube 2 which may be secured to the casing in an opening 1 in the latter, said lens tube being used in lieu of the ordinary lens tube. Disposed within the lens tube 2 are three lens plates or carniers. The forward lens late or carrier 3 has a square opening 3 at its center, in which is inserted a lens made in the following manner: A spherical plane convex lens has a square portion cut from the center each side of the s uare being three-sixteenths of the focal lengt of the lens. This square portion which is out from the lens is now of each of the openings drawings forming part of this about one-half its of light in forming theof the lens,..

cut into two equal parts, the thin edges of the two parts being placed together so as to obtain two different foci distant from one another three-sixteenths of the focal length of the total lens.

In Fig. 2 I have shown the two halves of the lens which I have designated 4. and 5 respectively. On each side of the plate or earner 3 is a metal plate. One of these metal. plates 6 is in front of the lens, the latter being held to the front plate by means of springs 7 or in any other suitable manner, see Fig. 5. The rear plate 8 is secured to the plate 3. At the centers of both of the plates 6 and '8 there are registering openings which are rectangular, the length being one-half of the diameter of the total lens, with a width one-sixth of its own length. These openings are shown at 6 and 8".

In order to hold the lenses tion I prefer to use a device like that shown at 3* in Fig. 7. On the outside of the plate 6 is a slidable diaphragm 9. The rear plate or carrier 10 contains its center the middle piano-convex lens having a focal length double that of the small lens. As shown in the drawings, the convex side is put toward the front disk or plate 3. This lens which I have shown at 11 is spaced from the front lens 4 and 5 a distance equal to of their focal length. This portion of lens 11 is also cut in the she of a square measuring on its side one-eighth of the focal length of the total lens.

The central plate or carrier 12 contains at center in a rectangular opening, two isosceles prisms, each of fifteen degrees, placed base to base. These prisms are cut square and have a height equal more or less to half the diameter of the small lens.

Each of the disks 3, 12, and 10 are vided with split spring rings, such as those shown at 13. which permit the disk or plate to slide with respect to the tubes 2, but which hold them firmly in their adjusted position. The metal ring 13 of the central late or carrier is extended laterally at its ttom, as shown at 13 this extension being connected by means of a pressure screw 19.

The prism 15 is ,stationary; the other prism 1 6 turns on small hinges by means oFascrew button 17, see Fig. 3, so as to bring the two images formed by the two front lenses 4 and 5, to the same focus,

in spaced relapro- The common axis of-the three plates or carriers must be perpendiculartothe g'ound glass plate of the camera. A lens of any focus can be used, and the apparatus made of different sizes by keepin the same proportions stated above. T e size of the sterescopic image varies according to the size of the apparatus, and measures in width about one fourth of the focal length of the front lens.

From the foregoing description of the various parts of the evice, the operation thereof ma be readily understoo The device is placed in the front of a suitable camera, and at a distance not less than twelve feet from the subject. The carrier of plate 12 is moved toward the pla e 10 as close as possible, and two imag s are formed on the ground glass. A 1good focus is taken by means of the left and image, and the button or screw 17 is manipulated, that is to say, it is turned to the right or left, until the right image is also brought in focus. he button 18 is now moved from right to left or vice versa, until the slightest distance between all horizontal lines of the images disappears. he central plate 12 is now moved forward until the slightest distance between all vertical lines of the images disappears. At this point there will be produced on the ound glass a stereoscopic image of the su ject.

In Fig. 8 I have shown a diagrammatic view of the path of the rays of light in forming an image. In this fi re AB is the ob ect, 4 and 5 represent t e two sections of the plane-convex lens laced with. their thin edges together in sue a manner that the distance between the two foci is equal to 1 3' of their focal length, and CD is the average distance from the front lenses to the object. At 15 and 16 are dispose the two isosceles prisms of 15 each, placed. base to base, these prisms being movable between the lens 11 and the front lenses 4: and 5. A artition 19 is disposed between the front lenses 4 and 5 and the prisms for the purpose of preventing the production of more than one image by each of the two front lenses. The image is produced at A B on the ground glass of the camera.

\Vhen the device is once focused it can be used without any change if the operator places it so as to have the subject, or the nearest part of his subject in focus.

I claim 2- 1. A stereoscopic camera, comprising a lens tube having therein three sli able ens carriers, one of said lens carriers having a pair of lenses arrang to focus at points distant from one another, another carrier having a pair of prisms and being movable toward and away from either of the other carriers, one of said prisms being stationary and the other being adjustable, and said ward the front, said lenses having risms being arranged with their bases ad- ]acent and the third carrier having a single large lens.

2. A stereoscopic camera comprising a lens tube, a lens carrier disposed at one end of the tube and slidable with respect to the tube, said lens carrier having a pair 0 piano-convex lenses with the plane side toward the front, said lenses having foci in the same )lane but spaced apart, a lens carrier at t e rear of the tube, having therein a lane-convex lens with the plane face of the lens toward the rear, and an intermediate carrier having a pair of prisms disposed with their bases adjacent, one of said risms being stationary and the other adustable.

3. A stereoscopic camera comprising a lens tube, a lens carrier disposed at one en of the tube and slidahle with respect to the tube, said lens carrier having a piano-convex lenses with the plane side tofoci in spaced apart, a lens carthe tube, having therein a plane-convex lens with the plane face of the lens toward the rear, an intermediate carrier having a pair of prisms disposed with their bases ad acent, one of said prisms being stationary and the other adjustable, and means for moving said intermediate lens carrier toward or away from either of the other carriers.

4. A stereoscopic camera comprising a lens tube, a lens carrier disposed at one en of the tube and slidable with respect to the tube, said lens carrier having a pair of lano-convex lenses with the plane side toward the front said lenses having foci in the same plane ut spaced apart, a lens carrier at the rear of the tube having therein a plane-convex lens with t e plane face of the lens toward the rear, an intermediate carrier having a pair of prisms disposed with their bases ad acent, one of said prisms being stationary and the other adjustable, intermediate lens means for moving said from either of the carrier toward or away other carriers, and means for rotating said air of plane-convex lenses about the axis of a lens tube.

5.- A stereoscopic camera comprising a lens tube, a lens carrier disposed at one end of the tube and slidable with respect tube, said lens carrier havin plane-convex lenses with the p one side toward the front, said lenses having foci in the same plane but spaced 'apart,'a lens carrier at the rear of the tube, having therein a plane-convex lens with the plane face of the lens toward the rear, an intermediate carrier having a pair of prisms disposed with their bases adjacent, one of said prisms being stationary and the other adjustable, means for moving said intermediate lens the same plane but rier at the rear of a pair of tothecarrier toward or away from either of the other carriers, means for rotating said pan of 'plano-eonvex lenses ahout the axis of a lens tube, and means for adjusting one of said )l'lSl-IIS with respect to the other.

6. in a stereoseopie ealnera, a pair of lens portions, eaeh of said portions eonsistinn of a part of aplano-eonvex lens, said port'ons having their thin edges omit-igllous a d'aphragm in the rear of said portions, said diaphragm having a small rectangular opening, a pair of 15 isosceles prisms disposed base to base with their contiguous parts in alinement with the contiguous parts of the said plano-eonvex lens portions, and a plano convex lens disposed in the rear of said prisms and acting as a condenser.

7. In a stereoscopic camera, a pair of lens portions, eaeh of said portions consisting of a part of a plalm-eonvex lens, said portions having: their thin edges contiguous, a diaphragm in the rear of said portions, said diaphragmhaving a small reetangular opening, a pair of 15 isosceles prisms disposed base to base with their contiguous parts in alinelnent with the contiguous parts of the said plano-ronvex lens portions, a plane-convex lens disposed in the rear of said prisms and acting! as a condenser, and means for varying the angular position of one of said prisms with respeet to the other.

JOSEPH A. DECUIR.

Witnesses:

l nnonnnn J. Burr, JOHN E. TOBIN. 

